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Investment Securities - Gross Unrealized Loss and Fair Value of Available-for-Sale Securities, Aggregated by the Length of Time (Detail) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value $ 30,879,111 $ 28,513,200
Less Than 12 Months, Unrealized Loss (802,318) (287,841)
12 Months or More, Fair Value 8,610,093 5,643,891
12 Months or More, Unrealized Loss (389,907) (356,109)
Total, Fair Value 39,489,204 34,157,091
Total, Unrealized Loss (1,192,225) (643,950)
U. S. Government Agency Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 7,188,603  
Less Than 12 Months, Unrealized Loss (311,397)  
Total, Fair Value 7,188,603  
Total, Unrealized Loss (311,397)  
U. S. Government Agency Mortgage-Backed Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value 23,690,508 25,670,832
Less Than 12 Months, Unrealized Loss (490,921) (130,209)
Total, Fair Value 23,690,508 25,670,832
Total, Unrealized Loss (490,921) (130,209)
Corporate Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Months, Fair Value   2,842,368
Less Than 12 Months, Unrealized Loss   (157,632)
12 Months or More, Fair Value 8,610,093 5,643,891
12 Months or More, Unrealized Loss (389,907) (356,109)
Total, Fair Value 8,610,093 8,486,259
Total, Unrealized Loss $ (389,907) $ (513,741)